How can you ignore a field during JSON serialization?

In Go, to ignore a field during JSON serialization, you can use the json:"-" tag in the struct definition. This indicates to the encoding/json package not to include this field in the output JSON.

Example:

type User struct {
    ID    int    `json:"id"`
    Name  string `json:"name"`
    Token string `json:"-"` // this field will not be serialized
}

user := User{ID: 1, Name: "Alice", Token: "secret"}

data, _ := json.Marshal(user)
fmt.Println(string(data)) // Outputs: {"id":1,"name":"Alice"}

Thus, the Token field will be ignored during serialization.